Libsoup: libsoup: denial of service via use-after-free in http/2 server

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• gnome libsoupall versions
• redhat enterprise linux10.0
• redhat enterprise linux6.0
• redhat enterprise linux7.0
• redhat enterprise linux8.0
• redhat enterprise linux9.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

• Red Hat Red Hat Enterprise Linux 10

  • 0:3.6.5-3.el10_1.11 and laternot affected · rpm
  • 0:3.6.5-3.el10_2.11 and laternot affected · rpm

• Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support

  • 0:3.6.5-3.el10_0.15 and laternot affected · rpm

• Red Hat Red Hat Enterprise Linux 6

  • all versionsaffected

• Red Hat Red Hat Enterprise Linux 7

  • all versionsunknown

• Red Hat Red Hat Enterprise Linux 8

  • all versionsunknown

• Red Hat Red Hat Enterprise Linux 9

  • all versionsunknown

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Other highest-scoring records for the same primary product.

• CVE-2017-2885An exploitable stack based buffer overflow vulnerability exists in the GNOME libsoup 2.58.
  46Plan
• CVE-2019-17266libsoup from versions 2.65.1 until 2.68.1 have a heap-based buffer over-read because soup_ntlm_parse_challenge() in soup-auth-ntlm.c does no
  40Plan
• CVE-2018-12910The get_cookies function in soup-cookie-jar.c in libsoup 2.63.2 allows attackers to have unspecified impact via an empty hostname.
  40Plan
• CVE-2026-2369Libsoup: libsoup: buffer overread due to integer underflow when handling zero-length resources
  36Monitor
• CVE-2026-5119Libsoup: libsoup: information disclosure via cleartext transmission of cookies during https tunnel establishment
  32Monitor
• CVE-2026-2436Libsoup: libsoup: denial of service via use-after-free in soupserver during tls handshake
  32Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1free(dev->buf);2/* ... another thread is still running ... */3process(dev->buf);

1lock(&dev->lock);2free(dev->buf);3dev->buf = NULL;4unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.