CVE-2026-15534Disclosure

LOWCVSS 5.7 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

Perl versions through 5.45.1 have out-of-bounds heap reads and writes during regular expression matching via an undersized superlinear cache in S_regmatch. The regex engine's superlinear cache holds one bit per subject position for each participating WHILEM node, so the bit count is the subject length plus one times the number of nodes. Nothing checks that product for positive overflow of the signed 32-bit count: a 286331153 byte subject matched against a pattern with 15 participating nodes stores the count as 14, leaving a two byte cache. The cache is then indexed from the real match position and node number, so reads go past the end of the allocation, and on failure CACHEsayNO sets a bit past it. A caller that matches an attacker controlled subject of this size against a pattern of this shape can crash the process or corrupt heap memory.

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0.5/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-125CWE-190CWE-787

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Threat summary

Patch or workaround signal is available
3 mentions across 2 observed days
Momentum state: stable

What's happening

Patch or workaround mentioned in 1 signal
Technical details provided in 2 signals
Disclosure: 2 classified signals
Peaked 1d ago at 2 mentions (2026-08-10); latest day: 1
3 total mentions across 2 days

Deep dive

Activity timeline3 mentions / 2d

Signal classification2 categories

Disclosure

266.7%

Patch

133.3%

Referenced assets2 URLs

By indicator

Classification over time

Date	Total	Labels

2026-08-10	2	Disclosure2
2026-08-18	1	Patch1

Full discourse3 posts

Rıdvan Yağlı@ridvanyagli38d
Patch
🚨 cPanel & WHM için güvenlik güncellemesi yayınlandı. Yeni build'lerde en önemli olanlar; - Roundcube 1.6.18'e güncellendi ve 9 Ağustos'ta yayımlanan güvenlik düzeltmeleri eklendi. - ClamAV 1.5.4'e güncellendi ve 9 farklı CVE için düzeltmeler içeriyor. - cpanel-perl, CVE-2026-15534 için güncellendi. - cpanel-pdns 4.9.17'ye güncellendi ve CVE-2026-52682 giderildi. Mutlaka güncelleyin.
Post summary
The text announces a cPanel & WHM security update that patches multiple CVEs, urging users to apply the updates promptly.
00052563
2.4K followersView on X
CVE@CVEnew46d
Disclosure
CVE-2026-15534 Perl versions through 5.45.1 have out-of-bounds heap reads and writes during regular expression matching via an undersized superlinear cache in S_regmatch. The regex… https://www.cve.org/CVERecord?id=CVE-2026-15534
Post summary
The snippet describes the out-of-bounds heap read/write vulnerability in Perl 5.45.1 and links to the official CVE record, but provides no proof of concept, exploit code, evidence of active exploitation, or patch information.
000201.2K
58.1K followersView on X
Infoflowcloud@infoflowcloud46d
Disclosure
🚨*CVE* CVE-2026-15534 Perl versions through 5.45.1 have out-of-bounds heap reads and writes during regular expression matching via an undersized superlinear cache in S_regmatch. The regex… https://www.cve.org/CVERecord?id=CVE-2026-15534 ----- Traducción: CVE-2026-15534 Las… http://infoflow.cloud`
Post summary
The tweet announces CVE‑2026‑15534, describing an out‑of‑bounds heap read/write in Perl’s regex engine, but does not provide a PoC, exploit, or patch information.
00000116
98 followersView on X

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