CVE-2026-49975

Published Jun 8, 2026

Last updated 5 days ago

CVSS high 7.5
Openresty
Tunneling protocol

Overview

Description
Memory Allocation with Excessive Size Value vulnerability in Apache HTTP Server's mod_http leads to denial of service via malicious HTTP requests. This issue affects Apache HTTP Server: from 2.4.17 through 2.4.67.
Source
security@apache.org
NVD status
Modified
Products
http_server, debian_linux

Risk scores

CVSS 3.1

Type
Secondary
Base score
7.5
Impact score
3.6
Exploitability score
3.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Severity
HIGH

Weaknesses

security@apache.org
CWE-789
0b0ca135-0b70-47e7-9f44-1890c2a1c46c
CWE-409

Social media

Hype score
Not currently trending

  1. 8 Apache HTTP Server CVEs patched in Debian 13.6 🚨 🔵 CVE-2026-29167 – mod_ldap UAF (CVSS ~9.8) 🔵 CVE-2026-48913 – mod_http2 UAF (7.3) 🔵 CVE-2026-34355/34356/42536 – buffer overflows 🔵 CVE-2026-29170 – mod_proxy_ftp XSS 🔵 CVE-2026-49975/44186 – DoS Up

    @techepages

    13 Jul 2026

    46 Impressions

    0 Retweets

    1 Like

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  2. CVE-2026-49975. 0day Intel: ⚠️CVE-2026-49975 (CVSS 7.5)⚠️ Critical HTTP/2 Bomb Denial-of-Service vulnerabili

    @lyrie_ai

    12 Jul 2026

    54 Impressions

    0 Retweets

    1 Like

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    1 Reply

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  3. After analyzing 60% of vulnerabilities from past week, CVE-2026-49975 has 77 articles published from different internet sources, no other cve has these many articles. More information here: https://t.co/SyyDujjO8C #vulnerability #CyberSecurity #ThreatIntel #CVE #SecurityAlert

    @stooee_

    26 Jun 2026

    33 Impressions

    0 Retweets

    0 Likes

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  4. After analyzing 60% of vulnerabilities from past week, CVE-2026-49975 has 77 articles published from different internet sources, no other cve has these many articles. More information here: https://t.co/SyyDujjO8C #vulnerability #CyberSecurity #ThreatIntel #CVE #SecurityAlert

    @stooee_

    25 Jun 2026

    46 Impressions

    0 Retweets

    0 Likes

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  5. After analyzing 51% of vulnerabilities from past week, CVE-2026-49975 has 77 articles published from different internet sources, no other cve has these many articles. More information here: https://t.co/SyyDujjO8C #vulnerability #CyberSecurity #ThreatIntel #CVE #SecurityAlert

    @stooee_

    20 Jun 2026

    43 Impressions

    0 Retweets

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  6. SIOSセキュリティブログを更新しました。 Apacheの脆弱性(Moderate: CVE-2026-34355, CVE-2026-42535, CVE-2026-43951, CVE-2026-44119, CVE-2026-44186, CVE-2026-49975, Low:複数)と2.4.68リリース #sios_tech #security #vulnerability #セキュリティ #脆弱

    @omokazuki

    9 Jun 2026

    126 Impressions

    0 Retweets

    2 Likes

    1 Bookmark

    0 Replies

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  7. #threatreport #LowCompleteness Codex Discovered a Hidden HTTP/2 Bomb | 03-06-2026 Source: https://t.co/iJtoMISHg7 Key details below ↓ 💀Threats: Slowloris_technique, 🎯Victims: Web servers, Apache httpd, Envoy, Nginx, Iis, Pingora 🏭Industry: Transport 🔓CVEs: CVE-2

    @rst_cloud

    8 Jun 2026

    234 Impressions

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  8. Top 5 Trending CVEs: 1 - CVE-2018-17144 2 - CVE-2026-46243 3 - CVE-2026-49975 4 - CVE-2025-49113 5 - CVE-2026-28318 #cve #cvetrends #cveshield #cybersecurity https://t.co/4Fua3CAN6W

    @CVEShield

    7 Jun 2026

    95 Impressions

    0 Retweets

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  9. SBが出たってことはアップデートはまだ時間かかりそうですかね... // RHSB-2026-007 HTTP/2 HPACK Denial of Service - httpd, nginx, Envoy (CVE-2026-49975, CVE-2026-47774) - "HTTP/2 Bomb" | Red Hat Customer Portal https://t.co/rTVi57F2Xq

    @w4yh

    7 Jun 2026

    66 Impressions

    0 Retweets

    0 Likes

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  10. 【主観的_最新のインシデント傾向】 レンタルサーバーのサービスも攻撃されています ログの種類やバックアップ手順は業者任せにせず確認しましょう ・NGINX/Apache HTTP/2 Bomb (CVE-2026-49975) ・cPanel/WHM (CVE-2026-4194

    @shunyat1031

    6 Jun 2026

    109 Impressions

    0 Retweets

    0 Likes

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  11. Slackware 15.0 released fixed net-tools and httpd packages addressing CVE-2026-154 stack-based buffer overflow and CVE-2026-49975 HTTP/2 DoS "HTTP/2 Bomb", Linuxsecurity reported. https://t.co/mKFtz5UhJr

    @threatcluster

    4 Jun 2026

    89 Impressions

    0 Retweets

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  12. CVE-2025-53020 (Moderate: 5.3) でmod_http2のアップデートが来ていますがこれですかね？ < CVE-2026-49975 // CVE-2025-53020 https://t.co/Mi7Jo3wIp8

    @w4yh

    4 Jun 2026

    125 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    1 Reply

    0 Quotes

Configurations

Related CVEs

  1. In PHP versions 8.2.* before 8.2.32, 8.3.* before 8.3.32, 8.4.* before 8.4.23, 8.5.* before 8.5.8, the AES-WRAP-PAD algorithm implementation in OpenSSL extension contains a buffer allocation flaw. The output buffer for the AES key-wrap-with-padding operation is sized from the plaintext length without accounting for RFC 5649 expansion. This may cause OpenSSL to write beyond allocated memory, corrupting heap metadata and triggering application abort.•CVE-2026-14355
  2. socat versions 1.8.0.0 through 1.8.1.1 contain a heap-based buffer overflow vulnerability that allows a malicious SOCKS5 proxy server to overwrite adjacent heap memory by exploiting a sign-extension flaw in the DOMAINNAME reply parser. During connection setup, the domain name length byte is read through a signed char field causing a negative bytes_to_read value that is implicitly converted to size_t, resulting in an unbounded heap write into the 262-byte reply buffer with attacker-controlled size and content.•CVE-2026-56123
  3. In the Linux kernel, the following vulnerability has been resolved: Revert "wireguard: device: enable threaded NAPI" This reverts commit 933466fc50a8e4eb167acbd0d8ec96a078462e9c which is commit db9ae3b6b43c79b1ba87eea849fd65efa05b4b2e upstream. We have had three independent production user reports in combination with Cilium utilizing WireGuard as encryption underneath that k8s Pod E/W traffic to certain peer nodes fully stalled. The situation appears as follows: - Occurs very rarely but at random times under heavy networking load. - Once the issue triggers the decryption side stops working completely for that WireGuard peer, other peers keep working fine. The stall happens also for newly initiated connections towards that particular WireGuard peer. - Only the decryption side is affected, never the encryption side. - Once it triggers, it never recovers and remains in this state, the CPU/mem on that node looks normal, no leak, busy loop or crash. - bpftrace on the affected system shows that wg_prev_queue_enqueue fails, thus the MAX_QUEUED_PACKETS (1024 skbs!) for the peer's rx_queue is reached. - Also, bpftrace shows that wg_packet_rx_poll for that peer is never called again after reaching this state for that peer. For other peers wg_packet_rx_poll does get called normally. - Commit db9ae3b ("wireguard: device: enable threaded NAPI") switched WireGuard to threaded NAPI by default. The default has not been changed for triggering the issue, neither did CPU hotplugging occur (i.e. 5bd8de2 ("wireguard: queueing: always return valid online CPU in wg_cpumask_choose_online()")). - The issue has been observed with stable kernels of v5.15 as well as v6.1. It was reported to us that v5.10 stable is working fine, and no report on v6.6 stable either (somewhat related discussion in [0] though). - In the WireGuard driver the only material difference between v5.10 stable and v5.15 stable is the switch to threaded NAPI by default. [0] https://lore.kernel.org/netdev/CA+wXwBTT74RErDGAnj98PqS=wvdh8eM1pi4q6tTdExtjnokKqA@mail.gmail.com/ Breakdown of the problem: 1) skbs arriving for decryption are enqueued to the peer->rx_queue in wg_packet_consume_data via wg_queue_enqueue_per_device_and_peer. 2) The latter only moves the skb into the MPSC peer queue if it does not surpass MAX_QUEUED_PACKETS (1024) which is kept track in an atomic counter via wg_prev_queue_enqueue. 3) In case enqueueing was successful, the skb is also queued up in the device queue, round-robin picks a next online CPU, and schedules the decryption worker. 4) The wg_packet_decrypt_worker, once scheduled, picks these up from the queue, decrypts the packets and once done calls into wg_queue_enqueue_per_peer_rx. 5) The latter updates the state to PACKET_STATE_CRYPTED on success and calls napi_schedule on the per peer->napi instance. 6) NAPI then polls via wg_packet_rx_poll. wg_prev_queue_peek checks on the peer->rx_queue. It will wg_prev_queue_dequeue if the queue->peeked skb was not cached yet, or just return the latter otherwise. (wg_prev_queue_drop_peeked later clears the cache.) 7) From an ordering perspective, the peer->rx_queue has skbs in order while the device queue with the per-CPU worker threads from a global ordering PoV can finish the decryption and signal the skb PACKET_STATE_CRYPTED out of order. 8) A situation can be observed that the first packet coming in will be stuck waiting for the decryption worker to be scheduled for a longer time when the system is under pressure. 9) While this is the case, the other CPUs in the meantime finish decryption and call into napi_schedule. 10) Now in wg_packet_rx_poll it picks up the first in-order skb from the peer->rx_queue and sees that its state is still PACKET_STATE_UNCRYPTED. The NAPI poll routine then exits e ---truncated---•CVE-2026-52945
  4. GNU SASL before 2.2.4 lacks sanitization of a short challenge in _gsasl_ntlm_client_step in the NTLM client, which could result in memory disclosure via a crafted server.•CVE-2026-56968
  5. libssh2 through 1.11.1, fixed in commit 7acf3df contains an out-of-bounds write vulnerability in ssh2_transport_read() that fails to enforce upper bounds on packet_length field. Remote attackers can send crafted SSH packets with excessively large packet_length values to corrupt heap memory and achieve remote code execution.•CVE-2026-55200

References

Sources include official advisories and independent security research.