CVE-2026-48959

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-05-27. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

IO::Uncompress::Unzip versions before 2.220 for Perl allow CPU exhaustion via per-byte read loop in fastForward.

fastForward() compares length $offset (the digit count of the offset, 1 to 19) against the chunk size $c instead of $offset itself, so $c shrinks from 16 KiB to 1-19 bytes per iteration.

Extracting a named entry from an attacker supplied zip via IO::Uncompress::Unzip->new($zip, Name => $target) drives a per-byte read loop scaling with the entry's compressed size, up to the non-Zip64 4 GiB cap.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
29.4%
KEV
Not listed

Published

May 27, 2026

Last Modified

May 29, 2026

Advisory Details (3)

Auto-updated Jun 4, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-48959: IO::Uncompress::Unzip versions before 2.220 for Perl allow CPU exhaustion via per-byte read loop in fastForward

http://www.openwall.com/lists/oss-security/2026/05/27/2
generic

Changes - metacpan.org

https://metacpan.org/release/PMQS/IO-Compress-2.220/changes
generic
https://github.com/pmqs/IO-Compress/commit/68db44076f4c1a86a2ffe53a958eac6cabaf72e2.patch

Vendor Advisories for CVE-2026-48959(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 95× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 176 total refreshes for this CVE.

  1. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-08 15:16 UTCEPSS rescore
  4. 2026-07-07 13:46 UTCEPSS rescore
  5. 2026-07-06 16:27 UTCEPSS rescore
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-05 02:30 UTCEPSS rescore
  8. 2026-07-04 06:31 UTCEPSS rescore
  9. 2026-07-01 15:07 UTCEPSS rescore
  10. 2026-07-01 11:48 UTCEG score recompute
  11. 2026-07-01 11:48 UTCVendor advisory
  12. 2026-07-01 11:48 UTCGHSA enrichment
  13. 2026-06-30 23:22 UTCEPSS rescore
  14. 2026-06-29 14:45 UTCEG score recompute
  15. 2026-06-29 14:45 UTCVendor advisory
  16. 2026-06-29 14:45 UTCGHSA enrichment
  17. 2026-06-28 22:20 UTCEG score recompute
  18. 2026-06-28 22:20 UTCVendor advisory
  19. 2026-06-28 22:20 UTCGHSA enrichment
  20. 2026-06-28 14:07 UTCEPSS rescore
  21. 2026-06-28 07:30 UTCEG score recompute
  22. 2026-06-28 07:30 UTCVendor advisory
  23. 2026-06-28 07:29 UTCGHSA enrichment
  24. 2026-06-28 04:56 UTCEPSS rescore
  25. 2026-06-28 04:56 UTCEPSS rescore
Show 75 more
  1. 2026-06-27 18:47 UTCEG score recompute
  2. 2026-06-27 18:47 UTCVendor advisory
  3. 2026-06-27 18:47 UTCGHSA enrichment
  4. 2026-06-27 06:57 UTCEG score recompute
  5. 2026-06-27 06:57 UTCVendor advisory
  6. 2026-06-27 06:57 UTCGHSA enrichment
  7. 2026-06-27 03:08 UTCEPSS rescore
  8. 2026-06-26 17:26 UTCEG score recompute
  9. 2026-06-26 17:26 UTCVendor advisory
  10. 2026-06-26 17:26 UTCGHSA enrichment
  11. 2026-06-25 21:10 UTCEG score recompute
  12. 2026-06-25 21:10 UTCVendor advisory
  13. 2026-06-25 21:10 UTCGHSA enrichment
  14. 2026-06-25 13:49 UTCEPSS rescore
  15. 2026-06-25 09:32 UTCEG score recompute
  16. 2026-06-25 09:32 UTCVendor advisory
  17. 2026-06-25 09:32 UTCGHSA enrichment
  18. 2026-06-24 14:05 UTCEPSS rescore
  19. 2026-06-23 21:33 UTCEPSS rescore
  20. 2026-06-23 21:33 UTCEPSS rescore
  21. 2026-06-22 14:25 UTCEPSS rescore
  22. 2026-06-22 14:25 UTCEPSS rescore
  23. 2026-06-21 14:56 UTCEPSS rescore
  24. 2026-06-21 14:56 UTCEPSS rescore
  25. 2026-06-21 01:59 UTCEPSS rescore
  26. 2026-06-21 01:59 UTCEPSS rescore
  27. 2026-06-19 19:26 UTCEPSS rescore
  28. 2026-06-19 19:26 UTCEPSS rescore
  29. 2026-06-18 17:52 UTCEPSS rescore
  30. 2026-06-18 17:52 UTCEPSS rescore
  31. 2026-06-17 21:20 UTCEG score recompute
  32. 2026-06-17 21:20 UTCGHSA enrichment
  33. 2026-06-17 17:53 UTCEPSS rescore
  34. 2026-06-17 09:44 UTCEG score recompute
  35. 2026-06-17 09:44 UTCVendor advisory
  36. 2026-06-17 09:43 UTCGHSA enrichment
  37. 2026-06-16 21:43 UTCEG score recompute
  38. 2026-06-16 21:43 UTCGHSA enrichment
  39. 2026-06-16 17:53 UTCEPSS rescore
  40. 2026-06-16 10:06 UTCEG score recompute
  41. 2026-06-16 10:06 UTCVendor advisory
  42. 2026-06-16 10:06 UTCGHSA enrichment
  43. 2026-06-15 22:26 UTCEG score recompute
  44. 2026-06-15 22:26 UTCVendor advisory
  45. 2026-06-15 22:26 UTCGHSA enrichment
  46. 2026-06-15 17:49 UTCEPSS rescore
  47. 2026-06-15 17:49 UTCEPSS rescore
  48. 2026-06-15 08:01 UTCEG score recompute
  49. 2026-06-15 08:01 UTCVendor advisory
  50. 2026-06-15 08:01 UTCGHSA enrichment
  51. 2026-06-14 23:18 UTCEPSS rescore
  52. 2026-06-14 20:22 UTCEG score recompute
  53. 2026-06-14 20:22 UTCVendor advisory
  54. 2026-06-14 20:22 UTCGHSA enrichment
  55. 2026-06-14 08:45 UTCEG score recompute
  56. 2026-06-14 08:45 UTCVendor advisory
  57. 2026-06-14 08:45 UTCGHSA enrichment
  58. 2026-06-13 23:00 UTCEPSS rescore
  59. 2026-06-13 21:02 UTCEG score recompute
  60. 2026-06-13 21:02 UTCGHSA enrichment
  61. 2026-06-13 04:22 UTCEG score recompute
  62. 2026-06-13 04:22 UTCVendor advisory
  63. 2026-06-13 04:22 UTCGHSA enrichment
  64. 2026-06-12 23:12 UTCEPSS rescore
  65. 2026-06-12 23:12 UTCEPSS rescore
  66. 2026-06-12 16:45 UTCEG score recompute
  67. 2026-06-12 16:45 UTCVendor advisory
  68. 2026-06-12 16:45 UTCGHSA enrichment
  69. 2026-06-12 05:06 UTCEG score recompute
  70. 2026-06-12 05:06 UTCGHSA enrichment
  71. 2026-06-11 17:29 UTCEG score recompute
  72. 2026-06-11 17:29 UTCVendor advisory
  73. 2026-06-11 17:29 UTCGHSA enrichment
  74. 2026-06-11 14:00 UTCEPSS rescore
  75. 2026-06-11 05:52 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-48959?
CVE-2026-48959 is a high vulnerability published on May 27, 2026. IO::Uncompress::Unzip versions before 2.220 for Perl allow CPU exhaustion via per-byte read loop in fastForward. fastForward() compares length $offset (the digit count of the offset, 1 to 19) against the chunk size $c instead of $offset itself, so $c shrinks from 16 KiB to 1-19 bytes per iteration.…
When was CVE-2026-48959 disclosed?
CVE-2026-48959 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on May 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-48959 actively exploited?
CVE-2026-48959 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 29.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-48959?
CVE-2026-48959 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-48959?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-48959, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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