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4 vulnerabilities found for libnsbmp by NetSurf
CVE-2026-111139 (GCVE-0-2026-111139)
Vulnerability from nvd – Published: 2026-10-15 18:57 – Updated: 2026-10-15 18:57
VLAI
EPSS
VEX
Title
NetSurf libnsbmp through 0.1.7 Out-of-Bounds Read via bmp_decode_mask
Summary
NetSurf libnsbmp through 0.1.7 contains an out-of-bounds read vulnerability in bmp_decode_mask() that allows attackers to read one byte past the image buffer by supplying crafted ICO files. Attackers can provide an ICO whose inner bitmap width is not a multiple of 8, causing a heap over-read that can crash applications calling bmp_decode().
Severity
5.5 (Medium)
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://hackmd.io/@haind-pwn/libnsbmp-rle-absolut… | technical-descriptionexploit |
| https://github.com/netsurf-browser/libnsbmp/blob/… | technical-description |
| https://download.netsurf-browser.org/libs/release… | product |
| https://github.com/netsurf-browser/libnsbmp | product |
| https://www.vulncheck.com/advisories/netsurf-libn… | third-party-advisory |
Impacted products
Date Public
2026-10-15 00:00
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CVE-2026-111138 (GCVE-0-2026-111138)
Vulnerability from nvd – Published: 2026-10-15 18:57 – Updated: 2026-10-15 19:44
VLAI
EPSS
VEX
Title
NetSurf libnsbmp through 0.1.7 Out-of-Bounds Read in RLE8 and RLE4 Decoders
Summary
NetSurf libnsbmp through 0.1.7 contains an out-of-bounds read vulnerability in bmp_decode_rle8() and bmp_decode_rle4() because absolute-run bound checks omit the word-alignment pad byte. Attackers can supply a crafted RLE8 or RLE4 BMP ending on an odd-length absolute run to cause a one-byte heap over-read, crashing applications decoding untrusted images.
Severity
5.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 19:44 UTC
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://hackmd.io/@haind-pwn/libnsbmp-rle-absolut… | technical-descriptionexploit |
| https://github.com/netsurf-browser/libnsbmp/blob/… | technical-description |
| https://github.com/netsurf-browser/libnsbmp/blob/… | technical-description |
| https://download.netsurf-browser.org/libs/release… | product |
| https://github.com/netsurf-browser/libnsbmp | product |
| https://www.vulncheck.com/advisories/netsurf-libn… | third-party-advisory |
Impacted products
Date Public
2026-10-15 00:00
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CVE-2026-111139 (GCVE-0-2026-111139)
Vulnerability from cvelistv5 – Published: 2026-10-15 18:57 – Updated: 2026-10-15 18:57
VLAI
EPSS
VEX
Title
NetSurf libnsbmp through 0.1.7 Out-of-Bounds Read via bmp_decode_mask
Summary
NetSurf libnsbmp through 0.1.7 contains an out-of-bounds read vulnerability in bmp_decode_mask() that allows attackers to read one byte past the image buffer by supplying crafted ICO files. Attackers can provide an ICO whose inner bitmap width is not a multiple of 8, causing a heap over-read that can crash applications calling bmp_decode().
Severity
5.5 (Medium)
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://hackmd.io/@haind-pwn/libnsbmp-rle-absolut… | technical-descriptionexploit |
| https://github.com/netsurf-browser/libnsbmp/blob/… | technical-description |
| https://download.netsurf-browser.org/libs/release… | product |
| https://github.com/netsurf-browser/libnsbmp | product |
| https://www.vulncheck.com/advisories/netsurf-libn… | third-party-advisory |
Impacted products
Date Public
2026-10-15 00:00
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CVE-2026-111138 (GCVE-0-2026-111138)
Vulnerability from cvelistv5 – Published: 2026-10-15 18:57 – Updated: 2026-10-15 19:44
VLAI
EPSS
VEX
Title
NetSurf libnsbmp through 0.1.7 Out-of-Bounds Read in RLE8 and RLE4 Decoders
Summary
NetSurf libnsbmp through 0.1.7 contains an out-of-bounds read vulnerability in bmp_decode_rle8() and bmp_decode_rle4() because absolute-run bound checks omit the word-alignment pad byte. Attackers can supply a crafted RLE8 or RLE4 BMP ending on an odd-length absolute run to cause a one-byte heap over-read, crashing applications decoding untrusted images.
Severity
5.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 19:44 UTC
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://hackmd.io/@haind-pwn/libnsbmp-rle-absolut… | technical-descriptionexploit |
| https://github.com/netsurf-browser/libnsbmp/blob/… | technical-description |
| https://github.com/netsurf-browser/libnsbmp/blob/… | technical-description |
| https://download.netsurf-browser.org/libs/release… | product |
| https://github.com/netsurf-browser/libnsbmp | product |
| https://www.vulncheck.com/advisories/netsurf-libn… | third-party-advisory |
Impacted products
Date Public
2026-10-15 00:00
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"value": "NetSurf libnsbmp through 0.1.7 contains an out-of-bounds read vulnerability in bmp_decode_rle8() and bmp_decode_rle4() because absolute-run bound checks omit the word-alignment pad byte. Attackers can supply a crafted RLE8 or RLE4 BMP ending on an odd-length absolute run to cause a one-byte heap over-read, crashing applications decoding untrusted images."
}
],
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"subConfidentialityImpact": "NONE",
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"version": "3.1"
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"descriptions": [
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"references": [
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"tags": [
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"url": "https://hackmd.io/@haind-pwn/libnsbmp-rle-absolute-pad-and-ico-mask-oob-read"
},
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"url": "https://github.com/netsurf-browser/libnsbmp/blob/ea063c9f46acb43e90208da14073332b505ef7e7/src/libnsbmp.c#L942-L982"
},
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"url": "https://github.com/netsurf-browser/libnsbmp/blob/ea063c9f46acb43e90208da14073332b505ef7e7/src/libnsbmp.c#L1096-L1147"
},
{
"tags": [
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"url": "https://download.netsurf-browser.org/libs/releases/libnsbmp-0.1.7-src.tar.gz"
},
{
"tags": [
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"url": "https://github.com/netsurf-browser/libnsbmp"
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{
"name": "VulnCheck Advisory: NetSurf libnsbmp through 0.1.7 Out-of-Bounds Read in RLE8 and RLE4 Decoders",
"tags": [
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],
"url": "https://www.vulncheck.com/advisories/netsurf-libnsbmp-through-0.1.7-out-of-bounds-read-in-rle8-and-rle4-decoders"
}
],
"title": "NetSurf libnsbmp through 0.1.7 Out-of-Bounds Read in RLE8 and RLE4 Decoders",
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}
}
},
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"datePublished": "2026-10-15T18:57:31.267Z",
"dateReserved": "2026-10-15T17:03:55.771Z",
"dateUpdated": "2026-10-15T19:44:28.460Z",
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