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🛡️ CVE-2026-6722 on Ubuntu — php5

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, the SOAP extension's object deduplication mechanism stores pointers to PHP objects in a global map without incrementing their reference counts. When an apache:Map node contains duplicate keys, processing the second entry overwrites the first in the temporary result map, freeing the original PHP object while its stale pointer remains in the map. A subsequent href reference to the freed node can copy the dangling pointer into the result. As PHP string allocations can reclaim the freed memory region, an attacker with control over the SOAP request body can exploit this use-after-free to achieve remote code execution.

Distribution advisory

This page covers CVE-2026-6722 as tracked by Ubuntu, for the package php5. The fix is available in version 7.0.33-0ubuntu0.16.04.16+esm19; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: High — total loss, or loss the attacker controls.

Affected software

UBUNTU-CVE-2026-6722 is recorded against 8 packages.

  • php5
  • php7.0 (fixed in 7.0.33-0ubuntu0.16.04.16+esm19)
  • php7.2
  • php7.4
  • php8.1 (fixed in 8.1.2-1ubuntu2.24)
  • php8.3 (fixed in 8.3.6-0ubuntu0.24.04.9)
  • php8.4 (fixed in 8.4.11-1ubuntu1.2)
  • php8.5 (fixed in 8.5.4-0ubuntu1.1)

Timeline and source

Published on 10 May 2026 and last revised on 6 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
www.cve.org (Report)
github.com (Report)
ubuntu.com (Advisory)
ubuntu.com (Advisory)

Other advisories for this package

php5 has other advisories on record. If you are patching this one, these are worth checking on the same host:

CVE-2026-6722 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-05-10
Updated 2026-08-20
Modified 2026-07-06
Fix URL N/A

Affected Packages

Software From version Fixed in
php5 — —
php7.0 — 7.0.33-0ubuntu0.16.04.16+esm19
php7.2 — —
php7.4 — —
php8.1 — 8.1.2-1ubuntu2.24
php8.3 — 8.3.6-0ubuntu0.24.04.9
php8.4 — 8.4.11-1ubuntu1.2
php8.5 — 8.5.4-0ubuntu1.1

Exploit Protection

Are you running php5?

UBUNTU-CVE-2026-6722 carries CVSS 9.5 Critical rating. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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