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VulnerabilityPublished

CVE-2026-12844: DROLSKY List::SomeUtils::XS · Out-of-bounds Write

Affects DROLSKY List::SomeUtils::XSSource CVE Database V5

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Not known to be exploited · CVSS 7.5 High : upgrade to 0.59 soon.

Data as of 7 Nov 2026, 23:24 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.6% chance of exploitation in 30 days – higher than 51% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 0.59
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 25 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 8 Nov 2026.

What to do

Upgrade List::SomeUtils::XS and List-SomeUtils-XS to 0.59.

Affected software

ProductAffectedFixed in
DROLSKYList::SomeUtils::XSAffected
  • <0.59
Fixed in
  • 0.59
GitHubList-SomeUtils-XSpkg:github/List-SomeUtils-XSOther threatsAffected
  • <0.59
Fixed in
  • 0.59

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Users should avoid using pairwise() with blocks that can return more than four times the length of the longer input array until a fix is available.

Description

List::SomeUtils::XS versions before 0.59 for Perl have a heap buffer overflow in the pairwise function. pairwise() collects the values returned by the block into a heap buffer sized to the longer input array, then grows the buffer before each copy with a single quadrupling (alloc <<= 2) instead of a loop. A block call that returns more than four times the current allocation in one invocation outgrows that one quadrupling, and the copy writes past the end of the buffer. Any caller of pairwise() whose block returns, for a single pair, more than four times the longer input array's length writes past the buffer and corrupts the heap.

References

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