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01 Record

CVE-2026-34183

Unbounded Memory Growth in the QUIC PATH_CHALLENGE Handler

HighPUBLISHEDCNA: openssl
CNA base score7.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
View raw JSON

02 Description

Unbounded Memory Growth in the QUIC PATH_CHALLENGE Handler

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
1.04% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 63.9% of scored records. A rank, not a probability.
NVD base score
7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD analysis status
Analyzed. NVD last modified this record on 2026-07-23.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-06-09 16:03Z4 MO AGO
Last updated
2026-06-10 15:51Z4 MO AGO
Reserved
2026-03-26
Assigning CNA
openssl
Record state
PUBLISHED
Severity
High (CVSS 7.5)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
  • CWE-1325Improperly Controlled Sequential Memory AllocationBase
  • CWE-770Allocation of Resources Without Limits or ThrottlingBase
Data version
5.2
Document digest
aea137c3a2242353d9d5620125190f57eef47a1921264054ce9daa631454483c

05 Affected products

VendorProductVersionsPlatforms
OpenSSLOpenSSL4.0.0 to < 4.0.1, 3.6.0 to < 3.6.3, 3.5.0 to < 3.5.7, 3.4.0 to < 3.4.6—

06 References

07 Fixed in

AlmaLinux 9

  • openssl
    Fixed in 1:3.5.5-4.el9_8
  • openssl-devel
    Fixed in 1:3.5.5-4.el9_8
  • openssl-libs
    Fixed in 1:3.5.5-4.el9_8
  • openssl-perl
    Fixed in 1:3.5.5-4.el9_8

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 10

  • openssl
    Fixed in 1:3.5.5-4.el10_2.alma.1
  • openssl-devel
    Fixed in 1:3.5.5-4.el10_2.alma.1
  • openssl-libs
    Fixed in 1:3.5.5-4.el10_2.alma.1
  • openssl-perl
    Fixed in 1:3.5.5-4.el10_2.alma.1

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 9

  • openssl
    Fixed in 1:3.5.5-4.el9_8
  • openssl-devel
    Fixed in 1:3.5.5-4.el9_8
  • openssl-libs
    Fixed in 1:3.5.5-4.el9_8
  • openssl-perl
    Fixed in 1:3.5.5-4.el9_8

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 10

  • openssl
    Fixed in 1:3.5.5-4.el10_2.alma.1
  • openssl-devel
    Fixed in 1:3.5.5-4.el10_2.alma.1
  • openssl-libs
    Fixed in 1:3.5.5-4.el10_2.alma.1
  • openssl-perl
    Fixed in 1:3.5.5-4.el10_2.alma.1

Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • openssl
    Fixed in 3.5.6-1~deb13u2

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • openssl
    Fixed in 3.6.3-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 25.10

  • edk2
    No fix yet
  • openssl
    Fixed in 3.5.3-1ubuntu3.4

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.04 LTS

  • edk2
    No fix yet
  • edk2-hwe
    No fix yet
  • openssl
    Fixed in 3.5.5-1ubuntu3.2

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.10

  • edk2
    No fix yet
  • edk2-hwe
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 22.04 LTS

  • nodejs
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.